CODEWITHSUNDEEP
octave
Jessica
Jessica

Reputation: 189

Octave manipulating images

I am trying to resize and rotate an image using octave. However when I try get the following error: Index exceeds matrix dimension... Anyone see what I am doing wrong?

I=imread('c:/cg/img/Lena.jpg'); % 128 x 128 uint
I2=rgb2gray(I);


alfa=.5;

for i=1:round(256*alfa)
  for j=1:round(256*alfa)

    is=round(i/alfa);
    js=round(j/alfa);

    if (is<1) is=1;  endif;    
    if (js<1) js=1;  endif;


 I3(i,j)=I2(is,js); 

   end
end

imwrite(I3,"c:/cg/lenax0.5.jpg","jpg");



for i=1:256
   for j=1:256
     I4(i,j)=I3(257-j,i);         %90
     I5(i,j)=I3(257-i,257-j);     %180
     I6(i,j)=I3(j,257-i);         %270
    end
end

I7=[I3 I4; I5 I6];
imshow(I7);
imwrite(I7,"c:/cg/lena_rotate_90_180_270.jpg","jpg");

Upvotes: 0

Views: 347

Answers (2)

Jessica
Jessica

Reputation: 189

Figured it out error was here I had the size wrong.

for i=1:256
   for j=1:256
     I4(i,j)=I3(257-j,i);         %90
     I5(i,j)=I3(257-i,257-j);     %180
     I6(i,j)=I3(j,257-i);         %270
  end
end

I had the size wrong needed to be 

for I=1:128 ect...

Upvotes: 1

carandraug
carandraug

Reputation: 13081

I can't make much sense of your code but yes, you're doing something wrong. You're not using the functions of the image package to imrotate and imresize. Don't forget to load the image package before calling those functions pkg load image.

Upvotes: 0

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